Preheat the oven to 425°F.
Slice the cauliflower into thick steaks (approximately 1 steak per serving) and lightly brush with olive oil. Season with salt, pepper, and a pinch of garlic powder.
Place the cauliflower steak on a baking sheet and roast in the oven for about 25 minutes, flipping halfway through, until golden and slightly crispy.
While the cauliflower roasts, press and cut the tofu into 1/2-inch slices. Season lightly with salt and pepper, then pan-sear in a non-stick skillet over medium heat until each side is golden (about 3-4 minutes per side).
Rinse and drain chickpeas, then toss them with a pinch of salt, pepper, and garlic powder. Spread them on a separate baking sheet and roast in the oven for 15 minutes or until crispy.
Prepare the lemon-tahini drizzle by whisking together tahini, lemon juice, garlic powder, a small pinch of salt, and a splash of water to reach a smooth, drizzling consistency.
To plate, place the roasted cauliflower steak on a serving plate, top with the seared tofu slices and roasted chickpeas. Drizzle generously with the lemon-tahini sauce and sprinkle hemp seeds over the top as a finishing touch.
Serve warm and enjoy the blend of crisp textures and bright, tangy flavors.